An early-stage venture fund, targeted at $50 million, and a new accelerator are coming to Newark to create a substantial technology industry.

Newark Venture Partners and its sister entity, Newark Venture Accelerator, expect to start accepting startups in October; the fund’s founder is Don Katz, who also is founder and chief executive of Audible.com, an Amazon.com subsidiary that moved its headquarters to Newark in 2007 and employs...